It would do the same as "show system services dhcp binding" but it would also lookup the description and add it to the output. I suspect this will be noticebly slower though.

The other thing thta bugs me is that the SRX won't accept a static binding outside the DHCP address pool. I think its common practice to reserver a portion of the subnet for statically reserved IPs that will not ever be used as DHCP addresses and manually allocate those for static bindings.

It would be nice if a future version of Junos added a decription field for static bindings and allowed static bindings with IPs outside the pool range.